Electromechanical switchboard-signal.



No. 878,112. I PATENTED{FEB.4,11903.

B. W. BRA'OKETT. ELEGTROMEGHANIGAL SWITOHBOARD SIGNAL.

APPLIOATION FILED MAY 29, 1907.

2 SHEETS-SHEET 1:

Sum/whiz 110. 8?$?,112. 111111111311 FEB. 1, 1908. B. W. 1111101111121.

ELEGTROMEGHANIOAL SWITOHBOARD SIGNAL.

APPLICATION FILED MAY 29, 1907.

2 SHEETS-SHEET 2.

- a citizen of the United States,

armature pivoted in close proximit ERNEST W. BRACKETT, OF ELYRIA, OHIO, AS

ELYRIA, OHIO, A CO SIGNOR TO THE DEAN ELECTRIC COMPANY, OF RPORATION OF OHIO.

ELEGTROMEOHANICAL SWITCHBOARD-SIGNAL Specification of Letters Patent.

Patented net. 4, 190a.

Application filed May 29 1907 Serial No. 3'76 l33,

To all whom it may concern:

Be it known that l, Ennns'r W. Benorgnrr, residing at Elyria, in the county of Lorain and State of Ohio, have invented certain new Improvements in Electromechanical SwitchboardSignals,' of which the specification, reference being had therein to the accompanyingdrawing.

My invention relates to electromechanical switch board signals, and it may be classed with those devices in which an electromagnet is provided with a comparatively heavy to said magnet, and attached to which is a ight target that is brought into view when the armature is attracted toward the pole-piece oi the magnet, and in which on circuit in the magnet coils, the weight of the armature overbalances that of the light target and the latter is swung back to its original position.

The object of my invention is to provide a signal which operates quickly and positively when the electromagnet controlling the signal is energized, and one in which the operating parts are automatically restored to their nor mal position as soon as the current-is cut oil.

A further object of my invention is to provide a self-contained indicator arranged in a compact form which can be readily assembled with other similar indicators on the switchboard and which can be readily removed without the necessity of dismantling its various parts.

Heretofore in devices of this kind trouble has been experienced in constructing the operating parts so that they will respond instantly to the energizing and dei'znergizing of the actuating magnets, owing to the fact that the indicator has connected. therewith an annals c which is attracted by the magnet wnich adheres thereto when the current energizing the latter ceases to how, due to the residual magnetism in the pole-piece. My invention obviates this objection. by providing 'means for instantly detaching the armature from the pole-piece and restoring the signal to its normal position' A further object of my invention is to provide a device having comparatively few operating parts, thus making it simple of o'cltructien and comparatively inexpenand useful following is a the breaking of the i sive to manufacture, while at the same time lessening the liability of the operating partsgetting out of order, which is often the case in devices employing more complicated mechanism. 7

A further object of my invention is to provide means whereby the operation of the signaling device will cause the closing of a circuit through certain contact pieces so that a local circuit having annudible signaling means, such as a night hell, can be closed which will give the. operator additional warning in case she is not in position to observe the dropping oi the target.

My invention is illustrated in the accompanying drawings in which- Figure 1 is a plan view oi" my invention. Fig. 2 is a side elevation, the ends of the device being shown partly in section. 3 is a rear end view of the device. Fig. is a front end view showingthe target and armature in normal position. Fig. 5 is a sectional view of the deviceon the line fl- A of Fig. 2 looking in he direction of the arrows. Figs. 6 to inclusive, are detail views of modified is of the target and armature.

Refer to the drawings, 1 denotes the coil oi electromagnet having a core 2. The said coil 1 is embraced by the arms 3 of a U-shaped return bar which is secured. to the core 2 by a retaining screw l which. clamps the Eel-shaped bar between said core and a non-magnetic plate 5. The arms 3 of the Ushaped bar are extended beyond the end of the, magnet and are provided with in wardly turned flanges 6. A spool head of insulating material 7 is provided at the for ward end of the magnet and the arms 3 ol the Ll-shaped bar are secured thereto by means of the screws 8. Secured to the inwardly turned flanges 6, by means of the screws 9, is a non-magnetic plate 10, provided with an opening 11.

The construction described above provides a main frame with an electroi'nagnet located at the rear end thereof. .ridjncent the forward end of said frame the arms 3 of the U-sh'aped bar are provided with openings 12 in which are journaled the reduced ends 13 of a spindle i l bearing a small rectangular frame. The bottom of the latter carries an armature 15 while at the top there is located a light curved target 16. Projecthig roan 1 on said tongue.

' duced wardly from said armature is a spring contact piece 17. I

Attached to the forward end of the central core or pole-piece 2 by means of a screw 18 is a forwardly extending are shaped tongue 19, provided with a laterally extending flange 20 at its top. A contact piece 21 is provided with an upturned end and is secured to the insulating member 7 by means of the binding screw 22. The plate 5 on the rear end ofthe for the terminals 24 of the'coil.

The operation of my invention is as follows: When current is passed through the coil 1, the magnet is energized and the armature is drawn toward the are shaped tongue 19. The upward movement of the armature is limited by the forwardly extending flange The other end of the frame is swung downward and the curved target is now brought into view through the opening 11 at the forward end of the frame. It will be noted that the peculiar shape of the target renders the latter easil r seen from the side as well as from the front, since it not only fills the opening but projects through the latter to some extent. The spring contact piece 17 is arranged to contact with the spring member 21 to close the local lamp or a arm bell circuit. These contacting members 17 and 21 also serve another useful urpose. It will be'noted that these mem ers contact before the armature has reached its upper position. Both members 17 and 21 are therefore under tension while the armature is being held bythe magnet. Now when the current is cut off from the coil 1 and the pole piece 2 is denergized, the reaction between the spring members 17 and 21 will force the armature away from the poleiece against any residual ma netism in' the atter. It will be observed, however, that while the magnet is energized, the springs are opposed by the force of maximum magnetic attraction.

the magnet is energized.

Figs. 6 to 14 show modifications of the target and armature. In Figs. 6 to 8 a hemispherical aluminium target or shutter 16, is mounted on the central portion of a non-magnetic spindle or shaft 14, by means of the two integral perforated arms 16? and 16 These arms are sprung over the reends of the shaft 14 and are held! against an inner shoulder by upsetting the edges of a second shoulder 14;, on the A further reduced n'al. The free ends of the arms 16 and 16 1 are bent inwardly, and a soft iron armature 15 I is riveted to them as shown in Fig. 8. In

order to make the area of the iron in the air gap as large as possible, the two sides of the armature are enlarged to extend on the sides of the tongue 19, as shown in Fig. 7 .c

In the construction shown inFigs. 9 to 12, the integral arms of the shutter 16 are bent inwardly and riveted to the shaft 14. The arms of the U-shaped iron armature 15 are secured to the ends of the shaft by u setting the outer shoulder on the latter in t e manner described above. Figs. 13 and 14 show my referred form of construction, which is a com ination of those shown in Figs. 6 to 12, inclusive. form, the shutter 16 is riveted to a non-magnetic shaft in the manner described. A U- shaped brass or other non-magnetic member 15 is secured to the ends of the shaft, and the iron armature 15 is riveted to the latter. The ends of the armature are extended in the manner shown in Fig. 7. i

Having thus described my invention what I claim and desire to secure by Letters Patent is 1. In an electromechanical switchboard signal, an electromagnet having a central core provided with an are shaped tongue at one end thereof, a U-shaped return bar secured to theother end of said core and pro a light hemispherical target having integral arms secured to said shaft at its central portion, a nonmagnetic U-shaped member secured to the shaft on the opposite side from said target, an armature secured to said nonmagnetic U-shaped member and having extended ends, said armature being adapted to swing toward the core of the magnet when the line is energized and to straddle said arcshaped tongue.

In this 2. In an electromechanical switchboard signal, an electromagnet having a central core provided with an arc-shaped tongue at i one end thereof, a U-shaped return bar. secured to the other end of said core and pro:

vided with forwardly extending arms, a nonmagnetic shaft journaled between said arms,

a light hemispherical target having integral arms riveted to said shaft at .its central portion, a nonmagnetic U-shaped member disposed on the opposite side of the shaft from said target and having its arms secured to the ends of said shaft, an armature provided with extended ends secured to said nonmagnetic U-shaped member and adapted to swing toward the core of the magnet when the latter is energized and to straddle the arc-shapedtongue.

3. In an electromechanical switchboard signal, an electromagnet having a central core provided with an arc-shaped tongue at one end thereof, a U-sha ed return bar secured to the other end of sai' core and rovided with forwardly extending arms, a s aft journaled meme In testimony whereof I efiix my Sig 1n presence 053 two Witnesses.

- ERNEST W. BEAU:

Witnesses:

RAY H. BLXNSON, GEO. SCGVEL LE between seidl arms, a target secured to saia sheften one side thereof, and an'armaoure having ext nded ends secured on the opposite side of said. shaft and adapted to swing ilOW'E itld the core of the magnet when the latter is energized and to etraddle said arm 

